Portable grinding apparatus



(No Model.)

M. LENNON.

PORTABLE GRIN DING APPARATUS.

No. 287,447. Patented Oct. 30 1883.

- llNrran ST TES PATE T @rrrca.

MICHAEL LENNON, OF SOMERVILLE, MASSACHUSETTS.

PORTABLE GRINDING APPARATUS.

' SPECIFICATION forming part of Letters Patent No. 287,447, datedOctober 30, 1883..

Application filed August 24, 1883.

To all whom, it may concern:

Be it known that I, lVIIOHAEL LENNON, a citizen of the United States,residing at Somerville, in the county of Middlesex and State ofMassachusetts, have invented certain new and useful Improvements inPortable Grinding Apparatus, and I do hereby declare that the same arefully described in the following specification and illustrated in theaccompanying drawings.

This invention relates to improvements in portable grinding apparatus,and it is carried out as follows, reference being had to the accompanying drawings, where- Figure 1, represents a side elevation of theinvention, and Fig. 2 represents a plan view. Fig. 3 represents across-section on the line A B, (shown in Fig. 1;) and Fig. 4 representsa cross-section on the line CD, (also shown in Fig. 1.) I

Similar letters refer to similar parts wherever they occur on thedifferent parts of the drawings.

a is the metal trough for containing water, as is usual in grindingapparatus. In one piece with the trough a is east the lower forkedclamping-piece, a a, adapted to be placed upon a bench or table, I), asshownin Fig. 1, and secured temporarily thereto by meansof thumbscrew apassing through a screwthreaded perforation in the lower portion, a, ofthe said forked clamping-piece.

c is the grindstone, through a central perforation in which is securedthe metal hub d, having flange d on one end and adjustablescrew-threaded collar (1 on its other end, which collar 6 is adjustableupon a screwthreaded part of the hub d, so as to secure the stone 0firmly upon the hub d, between its flange d and nut or collar (1.Through the hub (Z is made a square hole, into which is inserted thesquare shaft 6, the ends of which are cylindrical and made to rotate inbearings in the upper part of the trough a, as shown in Fig. 3. To oneend of the shaft 6 is secured the small pinion e, and through a hole inits extreme opposite end is a lateral perforation, through which isinserted a pin, 6, by which arrangement the shaft 6 is pre- (No model.)

vented from moving longitudinally during its rotation. i

f is a circular projection on the outside of the trough a, whichprojection serves as a spindle on which the gear-wheelf is supported,the latter gearing into the teeth of pinion 5 5 e, as shown in Figs. 1and 3.

f is ascrew screwed into a central screwthreaded perforation in the endof projection f, as shown in Fig. 3, so as to retain the wheel f in itsproper position on said projection, and to prevent I the said wheel fromdropping off the projection f when the apparatus is in use.

-f is a crank attached to gear-wheel f, and

adaptedfor the operator to take hold of to 6 5 impart a rotary motion tosaid wheel f, the pinion e, and grindstone 0..

To the forward end of the trough a is cast the bracket a", that servesas a rest and guide for the laterally-adjustable tool-holder, com- 7oposed of plate 9, with its upwardly-projecting stationary jawg, as shownin Fig. 4. On top of plate 9 is located the adjustable jaw g, which isadjustable to and from the jaw g by means of thumb-screw 9 passingthrough a perforation in j aw g and screwed through the jaw g, thelatter being guided on the plate 9 by means of the headed bolt g thatpasses through the slot in the plate 9, as shown.

g are downwardly-projecting ears from .80

the plate 9, to which is secured the guide-rod gflpassing looselythrough a perforation in the bracket a, as shown in Fig. 4.. i

a is a lip in the upper part of bracket a and it serves as an outerguide for the plate 9 when the apparatus is in use.

In using the machine, Isecure thetool, h, that is to be ground betweenthe jaws g and g by tighteningthe screw 9. By imparting a rotary motionto the crank f the grindstone c 0 ened accurately and in a very rapidmanner. 9 5

\Vhat I wish to secure by Letters Patent, and claim, is-

1. In combination with the grindstone c,

and the trough a and its clamping device a passing through perforationin bracket a", all IO a a the bracket a? a laterally-adjustable combinedand arranged as set forth, plate 9, its stationary jaw g, movable jaw g,In testimony whereof I have aflixed my sigregulating-screw g and ears gg, with guidenature in presence of two witnesses. pin g, as and for thepurpose set forth. I T

2. In a grinding apparatus, the herein-de- MICHAEL L scribed toolholder,consisting of bracket a WVitnesses: a slotted plate stationary jaw g,movable ALBAN ANDRI JN, jaw g, screw Z ears g", and guiderod g HENRYCHADBOURN.

